DESCRIPTION: Computes and returns the triangular window function: 1-|x| if x<1, 0 elsewhere.
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====tri_wave====
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SYNTAX: tri_wave({{ArgTypeReal}} x)
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EXAMPLE: ''tri_wave(0.5)''
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DESCRIPTION: Computes and returns the periodic triangular wave function of period T = 2, oscillating between two values +1 and -1 and having a value of +1 at x = 0.
====triangle_strip====